footer {
  box-shadow: 0 0 1px #ccc;
  position: fixed;
  left: 50%;
  transform: translateX(-50%);
  bottom: 0;
  min-width: 320px;
  max-width: 750px;
  width: 100%;
  height: 1.333333rem;
  background-color: #fff;
  z-index: 1;
  display: flex;
}
footer .item {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  font-size: .24rem;
  color: #999;
}
footer .item i {
  display: block;
  width: .426667rem;
  height: .426667rem;
  background: url(../images/底部菜单/课程-未选中.png) no-repeat;
  background-size: .4rem .426667rem;
}
footer .item:first-child {
  color: #6582ff;
}
footer .item:first-child i {
  display: block;
  width: .426667rem;
  height: .426667rem;
  background: url(../images/底部菜单/课程-选中.png) no-repeat;
  background-size: .4rem .426667rem;
}
